#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
int main()
{
 //C库函数
 printf("hello printf");
 fprintf(stdout,"hello fprintf");
 const char* message = "hello fwrite";
 fwrite(message,1,strlen(message),stdout);

 //系统调用
 const char* w = "hello write\n";
 write(1,w,strlen(w));

 //创建子进程
 fork();
 return 0;
}
